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/*
* Copyright (C) 2001 Julian Cowley
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/* Cisco Hot Standby Router Protocol (HSRP). */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.10 2005-05-06 07:56:52 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "interface.h"
#include "addrtoname.h"

/* HSRP op code types. */
static const char *op_code_str[] = {
"hello",
"coup",
"resign"
};

/* HSRP states and associated names. */
static struct tok states[] = {
{ 0, "initial" },
{ 1, "learn" },
{ 2, "listen" },
{ 4, "speak" },
{ 8, "standby" },
{ 16, "active" },
{ 0, NULL }
};

/*
* RFC 2281:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Version | Op Code | State | Hellotime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Holdtime | Priority | Group | Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Virtual IP Address |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/

#define HSRP_AUTH_SIZE 8

/* HSRP protocol header. */
struct hsrp {
u_int8_t hsrp_version;
u_int8_t hsrp_op_code;
u_int8_t hsrp_state;
u_int8_t hsrp_hellotime;
u_int8_t hsrp_holdtime;
u_int8_t hsrp_priority;
u_int8_t hsrp_group;
u_int8_t hsrp_reserved;
u_int8_t hsrp_authdata[HSRP_AUTH_SIZE];
struct in_addr hsrp_virtaddr;
};

void
hsrp_print(register const u_int8_t *bp, register u_int len)
{
struct hsrp *hp = (struct hsrp *) bp;

TCHECK(hp->hsrp_version);
printf("HSRPv%d", hp->hsrp_version);
if (hp->hsrp_version != 0)
return;
TCHECK(hp->hsrp_op_code);
printf("-");
printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code));
printf("%d: ", len);
TCHECK(hp->hsrp_state);
printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state));
TCHECK(hp->hsrp_group);
printf("group=%d ", hp->hsrp_group);
TCHECK(hp->hsrp_reserved);
if (hp->hsrp_reserved != 0) {
printf("[reserved=%d!] ", hp->hsrp_reserved);
}
TCHECK(hp->hsrp_virtaddr);
printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
if (vflag) {
printf(" hellotime=");
relts_print(hp->hsrp_hellotime);
printf(" holdtime=");
relts_print(hp->hsrp_holdtime);
printf(" priority=%d", hp->hsrp_priority);
printf(" auth=\"");
if (fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata),
snapend)) {
printf("\"");
goto trunc;
}
printf("\"");
}
return;
trunc:
printf("[|hsrp]");
}
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